Displays the edition form for the wikibox wbcss, which is supposed
to contain a CSS. The form is supposed to be displayed instead of the
wikibox wb. (This information is used to create menu buttons.)
The argument wikipage is supposed to be such that
the css associated to the wikipage is in wbcss. The arguments
version and content are as in display_wikitext_edit_form.

Adds an interactive menu and a title on top of content. The result
of displaying wb is supposed to be the argument content. The argument
active_item is used to know which tab to highlight in the menu.
The argument special_box is used to specify whether we should add
special button (see the documentation for special_box.
The classes argument must contain a list of css classes that will be
added to the outermost xhtml element.

Adds the container of the wiki around some content. The content
is given by the function gen_box, which takes as argument
the default style of the menus for the wikiboxes, and returns
the html code for the content, an option indicating whether
the content originates from a wikibox (and which one), an html
error code, and the title for the whole page. The page argument
is the url of the page wrt. the root of the wiki. For technical
reasons it must be specified as a string, and as the original
path (ie. string list). The function returns the entire
html page, and the http error code returned by gen_box.